CN2138863Y - A control device that shares a communication loop for internal and external lines - Google Patents

Abstract

A control device for sharing a call loop between an external line and an internal line mainly uses a transistor as an electronic switch of a control circuit connected to the external call loop, so that the external call loop can be used for the internal call only, and the call loop can simplify the selection of the internal and external control. The utility model utilizes the characteristics of excellent stability and easy multi-functional control of the transistor itself, and the circuit formed by the transistor is used as the electronic conversion control switch, which is more convenient than the circuit formed by the mechanical type or the relay as the switching or conversion control switch in the prior art, and can save the power and reduce the cost.

Description

The utility model is a control device for internal and external lines sharing a communication circuit. It mainly utilizes the low price and excellent characteristics of the transistor itself as an electronic switching switch for the communication circuit, so that the internal communication can be used for simultaneous communication through the external communication circuit. Shared, to simplify the selection of internal and external lines to control the call circuit, eliminate the high cost and inconvenience of separate installation of the conventional internal and external call circuits, reduce the manufacturing cost of the call circuit, and can be connected with office automation products in parallel, at the same time Become a smart multi-function control device.

According to the commonly used communication circuits of internal and external lines, they are designed and installed in separate ways. Among them, the cost of manufacture and installation of the internal communication circuit device is quite high, which is unacceptable for ordinary families and shops, so it is not acceptable. Can be widely used.

In addition, the conventional internal and external line communication loops are generally mechanically or electronically used as a switch for internal and external calls, which will have many disadvantages as follows:

1) Using a mechanical switch will not be able to receive electronic signals, and the controlled component products that generate electronic signals cannot be automatically controlled by wiring. Under such circumstances, it cannot meet the requirements of economic efficiency.

2) The relay is used as the changeover switch between the internal line and the external line. Although the electronic signal can be received, because the internal resistance of the relay is below 2000 ohms, the power consumption is too large, so the long-distance signal cannot be received, otherwise The signal will be distorted and receive difficulties or errors will occur, and because of its high cost and high power consumption, the system cannot be widely used in every home or store.

Therefore, the utility model has made innovative improvements for the various shortcomings of the above-mentioned conventional internal line and external line communication circuits.

The purpose of this utility model is to provide a control device for internal and external lines sharing a communication circuit, which mainly uses a transistor with excellent characteristics and relatively low price as the electronic conversion switch of the communication circuit, so that it can be used with fax machines, answering machines, Computer...and other office automation products are connected in parallel, and the internal call can use the original external line call circuit as a common circuit, simplifying the call circuit of the conventional internal line and external line control selection system, eliminating the need for internal and individual line call circuits The inconvenience of separate installation reduces the manufacturing cost of the communication circuit. Using transistors as the common control element of the internal line and external line control selection system will save power and be more convenient to assemble than mechanical or relay control elements. It makes the control simpler and easier, more widely used, and can greatly reduce the production cost, so that the development trend of telephone communication exchange and office automation can be widely used in every family. This kind of device has a novel and practical structure, which can be called an ideal of creation.

In order to further understand and understand the structural features and effects of the device of the present invention, the circuit block diagram and the wiring circuit diagram are described in detail as follows:

in:

Fig. 1 is the wiring circuit diagram of the utility model.

Fig. 2 is the circuit block diagram of the utility model.

Please refer to the accompanying drawings, the utility model is a control device for internal and external lines sharing a communication circuit, which is mainly connected with the external communication circuit 6 by using a circuit composed of a transistor with low price and excellent characteristics, so that the transistor is used as the electronic circuit The switching switch only needs to borrow an outside line call circuit 6 to make the internal line call and the external line call share simultaneously, without adding an expensive internal line call circuit for installation.

The positive and negative ends of the switch DC equivalent circuit 11 of the telecommunications bureau are respectively connected to the LA end of the transmission line and the LB end of the transmission line, and the LA end of the transmission line is respectively connected to the diode D1 and the diode D2 of the bridge rectifier polarity maintenance circuit 1 And the electronic conversion switch 2, the electronic conversion switch 2 is composed of capacitor C1 and transistor Q6; and the transmission line LB end is respectively connected to the diode D3 of the bridge rectification polarity maintenance circuit 1, between the diode D4 and the electronic conversion Switch 5, the electronic conversion switch 5 is composed of capacitor C2 and transistor Q7; the electronic conversion switch 2 and the electronic conversion switch 5 are connected by the transistor Q8, the base terminal of the transistor Q8 is connected to the collector terminal of the transistor Q9, and the transistor Q8 The emitter terminal of Q9 is connected to the positive power supply terminal of the internal DC power supply 9 of the system, and the base terminal of the transistor Q9 is connected to the control signal CB terminal of the microprocessor 10; the emitter terminal of the transistor Q6 of the electronic conversion switch 2 is connected to SPK The transfer end is connected to the positive source end of the communication circuit 6, and the emitter end of the transistor Q7 of the electronic conversion switch 5 is connected to the ground terminal of the communication circuit 6.

The electronic conversion switch 2 is composed of a capacitor C1 and a transistor Q6, wherein the capacitor C1 is mainly used to block direct current to allow the voice AC signal to pass through, and the transistor Q6 is used as an electronic switch; when the control signal CB terminal of the microprocessor 10 is at low When the voltage is high, the transistor Q8 and the transistor Q9 are turned on, and the transistor Q6 is turned on accordingly. Therefore, the voice AC signal of the communication circuit 6 can reach the LA end of the transmission line through the transistor Q6 and the capacitor C1.

The electronic changeover switch 5 is composed of a capacitor C2 and a transistor Q7. Among them, the capacitor C2 is also mainly used as a blocking direct current to allow the voice AC signal to pass through, and the transistor Q7 is also used as an electronic switch; when the control signal CB terminal of the microprocessor 10 is at a low potential, the transistor Q8 and the transistor Q9 are turned on, and the transistor Q7 Q7 will also be turned on thereupon, therefore, the voice communication signal of the communication circuit 6 reaches the end of the transmission line LB from the ground terminal through the transistor Q7 and the capacitor C2;

Bridge rectification polarity maintenance circuit 1 is composed of diode D1, diode D2, diode D3 and diode D4, which mainly ensures that the potential between diode D1 and diode D3 is negative, while the potential between diode D2 and diode D4 is positive , so that the signal sent by the external line communication circuit can be transmitted from the transmission line LA end, and return to the transmission line LB end through the system circuit. Then it is connected with the negative end of the direct current equivalent circuit 11 of the telecommunication bureau exchange.

The positive potential end of the bridge rectification polarity maintenance circuit 1 is connected to the electronic changeover switch 3, which is composed of transistor Q1 and transistor Q2, and the negative potential end is connected to the electronic changeover switch 4, the electronic changeover switch 3 is composed of transistor Q1 and transistor Q2. The changeover switch 4 is composed of transistor Q3 and transistor Q4. The electronic changeover switch 3 and the electronic changeover switch 4 are also connected to each other. The collector terminal of the transistor Q1 of the electronic changeover switch 3 is connected to the SPK transfer terminal and then connected to the call circuit 6 The positive source end of the transistor Q3 of the electronic conversion switch 4 is connected to the control signal CA end of the microprocessor 10, and the collector end of the transistor Q4 is connected to the ground end of the communication circuit 6.

When the control signal CA terminal of the microprocessor 10 is at a low potential, the transistor Q2 and the transistor Q3 are turned on, and the transistor Q1 is also turned on. At this time, the voice communication signal of the communication circuit 6 enters from the collector of the transistor Q1 , and then from the emitter end of the transistor Q1 to the LA end of the transmission line through the diode D2.

Also, when the control signal CA terminal of the microprocessor 10 is at a low potential, when the transistor Q2 and the transistor Q3 are turned on, the transistor Q4 will also be turned on, and the voice communication signal of the communication circuit 6 enters the transistor Q4 from the ground terminal at the same time. The collector terminal, and then the emitter terminal of the transistor Q4 reaches the LB terminal of the transmission line through the diode D3.

The positive power supply terminal of the internal DC power supply 9 of the system is respectively connected to the power input terminal of the microprocessor 10, the electronic conversion switch 8 and the transistor Q9, and the negative power supply terminal (ground terminal) is connected to the ground terminal of the microprocessor 10, and the communication circuit 6 , the electronic changeover switch 5 and the ground terminal of the electronic changeover switch 4 .

The electronic conversion switch 8 is mainly composed of a transistor Q5, the base terminal of the transistor Q5 is connected to the control signal CC terminal of the microprocessor 10, and the collector terminal of the transistor Q5 is connected to the inductive reactance circuit 7, and the inductive reactance circuit 7 and Connect the SPK transfer terminal and go to the call circuit 6.

The inductive reactance circuit 7 is composed of an inductance L1, which mainly enables the internal DC power supply 9 of the system to supply DC power to the communication circuit 6, and prevents the voice AC signal from the communication circuit 6 and the LA end of the transmission line from reaching the internal DC power supply 9 of the system. The positive power terminal is used to prevent voice AC signals from being affected by the DC load effect of the DC power supply 9 .

The electronic conversion switch 8 is mainly composed of a transistor Q5. When the control signal CC terminal of the microprocessor 10 is at a low potential, the transistor Q5 is turned on, so the DC power supply 9 is supplied to the communication circuit through the transistor Q5 and the inductance circuit 7. 6. It is used as the power supply for internal calls, and when it is used for external calls, its power supply is supplied by the DC equivalent circuit 11 of the switchboard of the telecommunications bureau.

When using the internal line to talk, the control signal CB and the control signal CC of the microprocessor 10 are both at low potential, so the AC communication circuit is from the transmission line LA terminal→capacitor C1→transistor Q6→SPK transfer terminal→communication circuit 6→ Transistor Q7 emitter→transistor Q7 collector→capacitor C2 returns to the LB end of the transmission line.

The DC communication circuit returns from the positive power terminal of the internal DC power supply 9 → the emitter of the transistor Q5 → the collector of the transistor Q5 → the inductance L1 → the SPK transfer terminal → the communication circuit 6 returns to the negative power supply terminal of the DC power supply 9 .

When talking outside the line, the control signal CA of the microprocessor 10 is low potential. Therefore, the AC communication circuit is switched from the LA end of the transmission line → the diode D2 → the emitter of the transistor Q1 → the collector of the transistor Q1 → SPK Terminal→communication circuit 6→collector of transistor Q4→emitter of transistor Q4→diode D3 returns to LB end of the transmission line; and when the outside line is in communication, its DC communication circuit is the same as the AC communication circuit.

When using internal calls, the required DC power is supplied by the internal DC power supply 9, and when making external calls, the required DC power is supplied by the DC power of the external telecommunication office switch at the LA end and LB end of the transmission line, as can be seen from the above , the power supply of the internal line and the external line are not the same, so when the extension of the internal line is used for intercommunication, it will not occupy the entry of the external line signal; it can simplify the communication circuit of the internal and external line control selection, and eliminate the conventional internal and external line communication circuit The high cost of separate installation reduces the manufacturing cost of the communication circuit and is economical and practical.

To sum up, the control device of this utility model, which shares a communication circuit with internal and external lines, is the first creation in terms of the shape and structure of the article. It is novel, can improve efficacy, and is practical. It can be called an ideal new creation.

Claims (8)

1, the control device of the shared talking path of a kind of interior lines outside line, the LA end that mainly connects transmission line by the positive power source terminal of the pc equivalent circuit (11) of telecommunication bureau, negative terminal then connects the LB end of transmission line, it is characterized in that: the LA end of this transmission line connects diode D1, D2 and the electronic type alteration switch (2) of bridge-type commutating pole maintenance circuitry (1) respectively, and transmission line LB end then connects diode D3, D4 and the electronic type alteration switch (5) of polarity maintenance circuitry respectively;

Electronic type alteration switch (2) connects the SPK change-over terminal and connects and enter talking path (6) positive power source terminal, electronic type alteration switch (5) then is connected with the earth terminal of talking path, interconnect between electronic type alteration switch (2) and the electronic type alteration switch (5) and with transistor Q8, the base terminal of this transistor Q8 connects the collector terminal of transistor Q9, and the emitter-base bandgap grading end of transistor Q9 is connected with the positive power source terminal of internal system DC power supply (9), and the base terminal of this transistor Q9 then is connected with the controlling signal CB end of microprocessor (10);

The positive potential end of bridge rectifier polarity maintenance circuitry connects electronic type alteration switch (3), the negative potential end then connects electronic type alteration switch (4), electronic type alteration switch (3) connects electronic type alteration switch (4), this electronic type alteration switch (3) also connects the positive power source terminal that the SPK change-over terminal is connected to talking path again, its base terminal of transistor Q3 of electronic type alteration switch (4) then connects the controlling signal CA end of microprocessor, and the collector terminal of transistor Q4 is connected with the earth terminal of talking path (6);

The positive power source terminal of internal system DC power supply connects power input, electronic type alteration switch (8) and the transistor Q9 of microprocessor respectively, and the face negative power end then connects the earth terminal of microprocessor, talking path, electronic type alteration switch (5) and electronic type alteration switch (4); The collector terminal of electronic type alteration switch (8) connects reactive unit (7), and this reactive unit also connects the SPK change-over terminal and is access to talking path again.

2, control device as claimed in claim 1, it is characterized in that, bridge rectifier polarity maintenance circuitry (1) wherein is made up of diode D1, diode D2, diode D3 and diode D4, guarantee to be negative potential between diode D1 and the diode D3, and be positive potential between diode D2 and the diode D4.

3, control device as claimed in claim 1 is characterized in that, the main system of electronic type alteration switch (2) wherein is made up of capacitor C1 and transistor Q6.

4, control device as claimed in claim 1 is characterized in that, the main system of electronic type alteration switch (5) wherein is made up of capacitor C2 and transistor Q7.

5, control device as claimed in claim 1 is characterized in that, the main system of electronic type alteration switch (3) wherein is made up of transistor Q1 and transistor Q2.

6, control device as claimed in claim 1 is characterized in that, the main system of electronic type alteration switch (4) wherein is made up of transistor Q3 and transistor Q4.

7, control device as claimed in claim 1 is characterized in that, the main system of electronic type alteration switch (8) wherein is made of transistor Q5.

8, control device as claimed in claim 1 is characterized in that, the main system of reactive unit wherein (7) is made of inductance L 1.

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